PSA_KEY_TYPE_DERIVE macro

A secret for key derivation. This key type is for high-entropy secrets only. For low-entropy secrets, #PSA_KEY_TYPE_PASSWORD should be used instead. These keys can be used as the #PSA_KEY_DERIVATION_INPUT_SECRET or #PSA_KEY_DERIVATION_INPUT_PASSWORD input of key derivation algorithms. The key policy determines which key derivation algorithm the key can be used for.